package cn.itcast.nio.c2;

import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.ArrayList;
import java.util.List;

import static cn.itcast.utils.ByteBufferUtil.debugRead;

@Slf4j
public class Server {

    // 使用nio来理解阻塞模式，单线程
    public static void main(String[] args) throws IOException {
        ByteBuffer buffer = ByteBuffer.allocate(16);
        // 1.创建服务器
        ServerSocketChannel ssc = ServerSocketChannel.open();
        // 2.绑定监听端口
        ssc.bind(new InetSocketAddress(8080));
        // 3.连接集合
        List<SocketChannel> channels = new ArrayList<>();
        while (true) {
            // 4.建立与客户端连接，用来与客户端通信
            log.debug("connecting...");
            SocketChannel sc = ssc.accept();    // 阻塞方法
            log.debug("connectted... {}", sc);
            channels.add(sc);
            for (SocketChannel channel : channels) {
                // 5.接收客户端发送的数据
                log.debug("before read... {}", channel);
                channel.read(buffer);   // 阻塞方法
                buffer.flip();
                debugRead(buffer);
                buffer.clear();
                log.debug("after read... {}", channel);
            }
        }
    }
}
